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Related Experiment Video

Updated: Feb 18, 2026

Building Langmuir Probes and Emissive Probes for Plasma Potential Measurements in Low Pressure, Low Temperature Plasmas
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Langmuir Probe Measurements in the Gaseous Electronics Conference RF Reference Cell.

M B Hopkins1

  • 1Physics Department, Dublin City University, Dublin 9, Ireland.

Journal of Research of the National Institute of Standards and Technology
|November 21, 2017
PubMed
Summary
This summary is machine-generated.

Langmuir probe diagnostics in GEC cells are reviewed, identifying key challenges and proposing standard measurements. Plasma density and sheath resistance are quantified in argon, with electron density scaling linearly with voltage.

Keywords:
GEC CellLangmuir probeplasma diagnostic

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Area of Science:

  • Plasma Physics
  • Diagnostic Techniques

Background:

  • Langmuir probe systems are crucial for plasma characterization.
  • Gaseous Electronics Conference (GEC) cells present unique challenges for probe diagnostics.
  • Existing data is insufficient for definitive parameter values.

Purpose of the Study:

  • Review Langmuir probe system usage in GEC cells.
  • Outline and discuss major diagnostic problems.
  • Propose standard measurements for GEC cell plasmas.

Main Methods:

  • Review of Langmuir probe diagnostics in two GEC cells.
  • Analysis of plasma parameters like density and sheath resistance.
  • Identification of features in electron energy distribution functions (EEDFs).

Main Results:

  • Plasma density in argon: 9x10^9 cm^-3 at 250 V RF voltage and 13.3 Pa.
  • Electron density scales linearly with applied voltage.
  • Plasma to ground sheath resistance: 810 Ω in argon (13.3 Pa, 0.1 A), inversely with current and sublinearly with pressure.

Conclusions:

  • Standard measurements are proposed despite data limitations.
  • Sheath resistance is a critical parameter in GEC cell diagnostics.
  • EEDF features can serve as tests for probe system resolution.